The spiciest Mexican dishes and how to survive the chile

Mexico and chile are inseparable. For Mexicans, the chile is not just an ingredient: it is a way of life, a cultural identity and, according to many, almost a religion. But for those who did not grow up eating chiles from childhood, facing certain Mexican dishes can be an experience somewhere between the mystical and the terrifying.

If you have ever tried a salsa in a Mexican restaurant and felt your mouth burst into spontaneous combustion, this article is for you. We are going to run through the spiciest dishes in Mexican gastronomy, understand the science behind the heat and, most importantly, give you real tips to survive the chile like a pro.

The Scoville scale: understanding heat

Before we dive in, it is important to understand how heat is measured. The Scoville scale (SHU - Scoville Heat Units) measures the concentration of capsaicin, the chemical compound responsible for the burning sensation:

• Bell pepper: 0 SHU - no heat
• Jalapeño: 2,500-8,000 SHU - moderate heat
• Serrano chile: 10,000-23,000 SHU - medium-high heat
• Chile de árbol: 15,000-30,000 SHU - high heat
• Chipotle: 5,000-10,000 SHU - medium heat with smokiness
• Habanero chile: 100,000-350,000 SHU - extremely hot
• Carolina Reaper: 1,400,000-2,200,000 SHU - dangerously hot

Most traditional Mexican dishes use chiles in the 2,000-30,000 SHU range, which is manageable heat for most people. The truly infernal dishes tend to use habanero or combinations of chiles that raise the intensity.

Ranking: from mild to extreme

Level 1: Mild heat (perfect for beginners)

Green enchiladas: Enchiladas with green tomatillo-and-serrano salsa have very manageable heat. The tomatillo lends acidity that balances the chile, and the cream added on top softens everything. It is the ideal dish to start your spicy adventure.

Tacos al pastor: The pastor adobo uses guajillo and ancho chiles, which are dried chiles of low heat. What you feel is more warmth than burn, with sweet notes from the achiote and pineapple. Almost nobody has trouble with pastor.

Red pozole: Although its intense red colour can be intimidating, pozole is made with guajillo and ancho chiles, both of low heat. The broth is more tasty than spicy.

Level 2: Medium heat (for those with some experience)

Red chilaquiles: It depends on the salsa, but traditional red chilaquiles made with chile de árbol have a good kick of heat. It is not unbearable, but it makes you sweat. The trick: the cream and cheese on top help enormously.

Birria tacos: Jalisco-style birria uses a mix of chiles that includes chile de árbol, and the resulting broth has notable heat. The consommé for dipping the tacos concentrates the heat. Ask for lime and onion to balance.

Red mole: Traditional mole has complexity rather than pure heat. Mulato, ancho and pasilla chiles lend depth without being aggressive. But some versions with chipotle or chile de árbol added raise the level considerably.

Level 3: High heat (for the brave)

Chile de árbol salsa: This dry salsa, made with toasted chiles de árbol, is one of the most common in Mexican taquerías and is quite spicy. In Spain, many restaurants keep it on the table. If you see it reddish-orange and it smells of toasted chile, proceed with caution.

Camarones a la diabla: As the name suggests, these shrimp are prepared in the style of the devil. The sauce uses chile de árbol, chile morita and sometimes chipotle in generous quantities. It is delicious but intense, and the fat from the oil the shrimp are cooked in makes the heat cling to your mouth.

Chiles toreados: These are whole serrano or jalapeño chiles, roasted in oil with salt and lime. Each bite is a game of Russian roulette: some are mild, others make you cry. They are addictive once you learn to handle them.

Level 4: Extreme heat (experts only)

Black aguachile: The Sinaloa-style aguachile in its black version uses chiltepin chile, one of the spiciest in Mexico. Raw shrimp marinated in lime with this sauce is an explosion of heat that lasts several minutes. Delicious but devastating for the uninitiated.

Habanero chile salsa: The Yucatec habanero chile is the king of traditional Mexican heat. A pure habanero salsa, with red onion and sour orange, can exceed 200,000 SHU. A teaspoon is enough to flavour a whole dish. Two teaspoons and you start to question your life choices.

Habanero chile tamales: In Yucatán there are steamed tamales filled with cochinita pibil and fresh habanero salsa. They are incredibly tasty but the heat level is among the highest in traditional Mexican cooking.

The science of heat: why does it burn?

Capsaicin, the compound responsible for the heat, is not really a flavour. It is a pain signal. Capsaicin activates the TRPV1 receptors in the mouth, the same ones that detect physical heat. Your brain interprets the signal as a "burn" even though there is no real damage.

This explains why:

• You sweat: Your body thinks it is hot and activates the cooling system.
• Your eyes water: A defensive response by the body to what it interprets as an attack.
• You feel euphoria afterwards: The brain releases endorphins to counter the "pain", creating a feeling of well-being. This is the reason chile is addictive.

10 tips to survive the heat like a Mexican

1. Milk or dairy, ALWAYS: The casein in milk is the only molecule that can break down capsaicin. Cream, cheese, yogurt or a glass of milk are your best defence. NEVER water - water spreads the capsaicin all over your mouth.
2. Corn tortilla: The starch in the tortilla mechanically absorbs the capsaicin. This is why Mexicans always eat with tortilla. White bread works too.
3. Lime: The acidity of lime helps partially neutralise the capsaicin. A classic Mexican trick: bite a lime after a very spicy mouthful.
4. Sugar or honey: Sucking a sugar cube or taking a spoonful of honey can ease the heat. Sugar competes with capsaicin for the receptors.
5. Do not touch your eyes: Capsaicin is fat-soluble and stays on the hands for hours after touching chiles. If you have handled chiles, wash your hands with soap and oil before touching your face.
6. Start slowly: Tolerance to heat is built up gradually. Start with jalapeños, move on to serranos, and one day you will reach the habanero.
7. Eat something first: An empty stomach amplifies the heat. Always eat something before facing very spicy dishes.
8. Rice: Like the tortilla, rice absorbs capsaicin. Mexican rice is a compulsory accompaniment to spicy dishes for this reason.
9. Breathe through your nose: Breathing through the mouth intensifies the burning sensation. Breathe through your nose, slowly.
10. Enjoy the process: Mexicans do not eat chile to suffer: they enjoy it. The post-chile endorphin rush is real and addictive. Accept the heat as part of the experience.

Why can Mexicans take more heat?

It is not genetics, it is habit. Mexicans start eating chile from a very young age (fruit with chile and lime is a common children's snack). Over the years, the TRPV1 receptors become desensitised, requiring more capsaicin to produce the same reaction. It is literally years of training.

The good news: anyone can develop a tolerance to heat within a few weeks of gradual exposure. Start by adding a pinch of chili powder to your meals, try low-heat salsas, and work your way up. In a month you will notice a huge difference.

Chiles to buy in the UK and practise with

You can find these chiles in Mexican shops and increasingly in supermarkets:

• To start: Dried ancho chile, dried guajillo chile (both very mild)
• Intermediate level: Chipotle in adobo (canned), dried chile de árbol
• Advanced level: Fresh habanero chile (sometimes in larger supermarkets)
• For the brave: Bottled Yucatec habanero salsa

Explore our complete guide to Mexican chiles to learn about all the varieties and their uses in cooking. And remember: heat is not a punishment, it is an acquired pleasure that opens up a universe of flavours that exists in no other cuisine in the world.